PPP leader Naheed Khan on Sunday said that the Government of Pakistan was not serious in capturing the killers of former Prime Minister Benazir Bhutto. Speaking to media here, Khan said both people and history would not pardon the rulers if Bhuttos assassins were not arrested. She said that Syed Yousuf Raza Gilani, who became the Prime Minister due to sacrifice of BB, should have demonstrated some seriousness regarding arrest of her (Bhutto) killers.